Taleborn

Paul Lee, Solo Developer

Brooklyn, NY
Solo developer Paul Lee who built Taleborn, the AI-powered RPG after teaching himself to code and moving to New York from Korea Taleborn’s Chronicle of Battle mode uses AI to generate fight scenes and battle results.
A world of his own

When Paul Lee thinks back on his first year in the U.S. after moving over from Korea, he takes stock of how so much has changed.

He had gotten married. He had quit his marketing job. And he found himself in a new country, face-to-face with an existential question: what now?

It turns out, the answer was to start his own business, an app business to be precise.

But he couldn’t just get started. He was a marketer after all, and admittedly, didn’t have the technical chops to really know how.

So he set a goal: maybe he could teach himself enough coding in a month to build an app, and to close that knowledge gap.

“I was wrong,” he ended up discovering.

It would actually take him six months to scale that learning curve. But it was well worth it, because by the end of it all, Paul managed to build his first working app. It was a whiskey journaling tool, created for people who wanted to keep notes on all the varieties they’d tasted before.

It was personal too, tied to his own love for whiskey. But alas, as any marketer is bound to experience at some point in their career: the product just didn’t quite find its footing with an audience, at least not at the scale that Paul had hoped for.

So Paul archived the lesson, and took it with him on his next quest — this time, the clues to his next idea would come from his own childhood.

Paul had grown up with an active imagination, always daydreaming, constantly inventing worlds. Heroes. Villains. Battle scenes. Places that didn’t exist, except in his own mind.

Then it hit him: “I could make all those characters, and all those places a reality, with some help from AI.”

And that bit of alchemy: human creativity mixed with AI, ultimately gave rise to Taleborn, an AI text-based RPG whose name means “a tale is born.” The game lets people create characters, heroes, then pits them against one another in an imaginary battlefield, where AI decides the ultimate victor.

So when it came time for Paul to share an early version of Taleborn on Reddit, to test the waters, he had only expected to round up a small party.

What he got instead was more like an entire guild.

“People loved it,” he says. “People came in and sent me a lot of feedback. They loved the idea, and what’s more, they wanted to contribute their ideas into my app.”

It was a marketer’s paradise: people were more than playing, they were commenting, communing, suggesting, even creating.

“When people come in and write a good story about how they enjoyed a feature I implemented, I feel incredibly happy,” Paul shares. “Now I understand why people get into solo development.”

The Taleborn app gives players different ways to explore AI-based adventures.
The cost of every quest

If you like to play RPGs, then you must know how each one has its own kind of resource to manage. Health. Mana. Inventory. Gold.

But as an AI heavy app, Taleborn had its need for a resource too, and it came in the form of compute.

As Paul explains it, the app uses AI to run a lot of the game’s mechanics: character creation, battles, storytelling, dungeons, the sense that each adventure could (and will) unfold differently.

To make that kind of content generation available on tap, Paul leans on tools like Gemini, but those tools can also come with its own set of costs.

“Everything users do in my app actually becomes a cost to me,” explains Paul. “I use AI, and I’m not just using local AI. I’m using high-end AI, Gemini, cloud, and stuff.”

So to cover his costs, Paul put Google AdMob into Taleborn right away, choosing it to show ads in his game for a few reasons: ease of integration, analytics, as well as mediation features (letting him manage multiple ad networks at once).

That decision was not without some angst for Paul at first. Ads can be tricky in games; Paul wondered if players might push back.

But Paul never tried to hide what Taleborn was: from his marketing to his app store listings, players could tell right away that it was an AI-powered RPG. So Paul hoped that his players would understand that running all that AI didn’t come free.

Fortunately, his players did more than understand; in fact, some even asked for more ads in the app, especially if ads would let them keep using the AI features, guilt-free.

“The funny thing is that people on Discord asked me to put more ads in my app,” Paul adds. “They didn’t want to feel bad about getting a result without any cost.”

Their reaction gave Paul the confidence boost he needed to lean even more into the ads model, eventually introducing a format known in the industry as rewarded ads, where players can earn some kind of in-game benefit or currency in exchange for watching or engaging with an ad.

Today, Taleborn makes money from ads alongside in-app purchases, with ads making up 30% of the revenue. And for a solo developer like Paul, running an AI-heavy game, that’s enough to help keep the app free and accessible to all in the land.

Plus, AI does more than make stuff happen on the app’s front-end. Behind the scenes, Paul uses Gemini to brainstorm new features and generate visual assets; he uses Antigravity (Google’s AI coding assistant) to help with development; and he leans on AI to help him run the rest of the business, including finance, and yes, even marketing.

“The funny thing is that people on Discord asked me to put more ads in my app. They didn’t want to feel bad about getting a result without any cost.”
Taleborn’s battle results generated by AI showing Spaghetti Man in a matchup with Tomato Monk.
A story that players build together

Meanwhile, the humans playing Taleborn have been keeping themselves busy.

There’s a wiki. There’s written lore. Character albums. Even custom dungeons.

But Paul’s no stranger to this level of enthusiasm. He’s seen it before, from the likes of those who play tabletop campaigns.

In fact, Taleborn’s players tend to live and breathe genre fiction, especially tabletop RPGs like Dungeons & Dragons that are a hotbed for open-ended storytelling. Inventing characters, places, backstories, then seeing where the next turn takes them — it’s all second nature to them.

And they mean a lot to Paul too. It’s just him working on Taleborn at the end of the day, but it feels more collaborative these days, with the amount of players bringing new ideas to the table all the time, building upon what Paul’s creating.

All the while, Paul’s managed to really find his groove in his new home country, even if it means working a lot, often over weekends, but then again he no longer sees work the same way either.

“Now I feel like working is fun for me. I think it’s because I’m building my own stuff, not doing someone else’s work,” he says.

And as for Taleborn, the next chapter of its story is already well underway. In fact, Paul recently launched multiplayer mode for the game, and hopes it will encourage players to invite their friends to play along with them.

If Taleborn grows enough, Paul’s open to bringing someone on board to help manage the app, giving him time to build other AI games that’s been brewing in his imagination, maybe even explore other categories of apps while he’s at it.

Either way, one thing's for sure: ads will be part of the formula. “As long as you have a good reason behind it, people actually understand why they have to watch the ads,” he reflects.

In a way, Paul is still doing what he did as a kid: building worlds in his head. The difference is that now, other people get to step inside them too.

About the Publisher

Paul Lee is the developer behind Taleborn, an AI-powered hero RPG where players can create characters, place them into stories, then pit them against one another, with AI as the arbiter over who wins. Originally a marketer in Korea, Paul taught himself to code after moving to the U.S. and launched Taleborn in 2025. Today, he uses AI models such as Gemini to help build, and solutions such as Google AdMob to help him monetize, all while engaging with his player community to grow and improve the app.

Taleborn’s Umbral Shogunate adventure mode brings storytelling to life through fantasy scenes and player-driven storytelling.